Locomotive boiler



Patented June 2, 1931 UNITED STATES PATENT YF WALTER mnmsorr, or CHICAGO, ILLINOIS, ASSIGNOR TO nocoivro'rivn rrnnnox COM- PANY, OF CHICAGO, rumors, A CORPORATION or DELAWARE LOCOMOTIVE BOILER Application filed August 17, 1929. Serial No. 388,665.

This invention relates to improvements in locomotive boilers and it. consists of the mat, .ters hereinafter described and more particularly pointed out in the appended claims.

The primary object of the' invention is to provide in a thermic siphonequipped locomotive boiler, a novel connection for the inlet end of said siphon, with a portion of the firebox sheet, which while being water tight will. permit of that amount of movement which said end takes on under temperature changes. a

Still another object of the invention is to provide such a connection which though disposed between inner and outer sheet parts of the boiler, in no manner interferes with r the cleaning and flushing out of said siphons.

' These objects of-the invention as well as others together with the many advantages thereof, will more fully appear as I proceed with my specification. 1

In the drawings 'Fig. 1 is a longitudinal vertical sectional view through the firebox end of alocomotive boiler, embodying my invention.

7 Fig. 2 is a fragmentarydetail sectional view of parts shown in the lower right hand corner of Fig. 1 on an enlarged sealer Referring nowin detailto thatembodimentof the invention illustrated-,in'the accompanying drawings, the boiler includes a firebox comprising-a flue sheet. 1, an ,1111161' rear sheet 2, and a crown sheet 3 extending therebetween. 4 indicates one of the side sheets of the firebox which includes a fire chamber 5 and a combustion 6 forward of the same. =The bottom 7 of the combustion chamber ismade as a continuation of the inner front throat sheet. 8;

10 indicates the shell on the bone, 11 the outer rearsheettherefor and 12 indicates the outer front throat sheet of the boiler. Sev- Y eral of the :sheets mentioned provide the front-water leg or throat 13, the rear water leg 14 and side water legs '(not shown) all.

in communication with the boiler water space of the boiler and closed at. their bottom end by the mud ring 15. The open bottom of the fire chamber 6 :has the usual'grate as indicated by the dotted line 16 and inthe fine sheet 1 are secured the usual fines 1 through which the productsfof combustion'pass on their way to the smoke box at the front end of the boiler. The construction described may be taken as typical of a present day locomotive boiler. 1 H 1 To increase the efficiency of boilers having fireboxes ofv this type, water steaming and circulating elements are employed both in the fire chamber and in the combustion chamber. Such elements usually are what have now become known as the/Nicholson thermic siphons and each comprisesa fiat hollow body disposed longitudinally'of the firebox and opening at one end through the crownfsheet and terminating at the other end ina tubular inlet neck; the neck of the siphon in the firebox opening through and being connected to the inner throat sheet8 and thefneck of the siphon in the combustion chamber opening through and being connected to the bottom wall 7 of the combustion chamber; v 'As the flat hollowbody of the siphons presents a considerable heating surface area to the products of combustion, it isapparent that a movement of the elements develops under changes of temperature. Heretofore,

' it has been attempted to accommodate such movement by forming annularly corrugated parts in the front throatsheet 8 and bottom wall 7 of the combustionchamber to provide flexible diaphragms but-the" same do not permit that degree of flexibility desired or the accessibility necessary for easy cleaning and inspection purposes.

In Fig; 1 is illustrated inside elevation two of such siphons,each indicated as a-whole by the numeral 17 and 18 respectively, with the former disposed in the fire chamber and the latter disposedin the combustion chamber, VThenumberof siphons of course is .dependent upon the size of the firebox "and in some instances there is apluralityof such siphons' in one or the other of said chambers.

'As shown herein for the'sake of simplicity,

and convenience only onesiphon is shown in each chamber. The siphon 17 includes a flat hollow, staybolted body 17 which is fixed in the rear part of the'crown sheet 3 and opens therethrough, and a tubular inlet neck 1"?" disposed at substantially a right angle to the plane of the throat sheets 8 and 12 respectively with which it is associated. The siphon 18 includes a flat hollow staybolted body-18- which is fixed in the front part of the crown sheet 3 and opens tllGIGtllI'OHgll and a tubular inlet neck 18, the bottom end of which is disposed at substantially a right angle to the plane of the bottom wall? of the combustion chamber. l

In the throat sheet 8 is provided an opening 20 and to the parts of said sheet within the fire chamber adjacent said opening is fixed a plate 21 through-which the inlet end of the siphon neck 17?? freely extends, the extremit of said neck having metallic collar 22' o nonco'rrodible metal fixed thereon. 23 indicates an annular plate disposed in V the opening 20 in the throatsheet 8, so asto surround the collar 22. I 1 1 The topend ofsaid annular plate is fiat and'is there provided with an annular groove 24 to receive an annular {compressible gasket or'r'ing 25 that engages directly against the adjacent" fac of the plate 21. The bottom surface of theplate 23 is providedwith a convexed recess 26 in which snugly'seats a compressible gasket or packing 27 which sinrounds and is in directengagementwiththe collar 22 on the inlet neck 17" of the siphon 17.

A helically coiled expansion spring 28 sur rounds the extremity o'fsaid neck and collar and engages atone end ag'ainst thef packing ring 27 and enga es at its othe'ri'end a ainst a reinforcing seat plate 29 on the inner face of the outer throatsheet l2; Said plate'has lugs to prevent lateral movement of the spring 28 a d a washout plug-31 is 'threaded through the sheet 12iint o saidplate. V vIn the bottom walls? ofthe combustion chamber is formed opening 20? in which 'is welded a cup shaped member 29? disposed in r the water sp ace, othe{boi1er between said forded between :said water space and the incombu tion chamber bottom wall7 a'nd the shell 10; This CUP shaped member has both a bottoniand side openings29 a1'1d 29 respectively, whereby communication is atterior of said up shapedmemben, Associated with the flanged top end of said cup shaped member is a plate 2'1 -having a central o ening therein, down through which the end oi the -'s'1phon.neck 18 extends. On said neck is secured a collar 22 of noncor'rodible metal. surroundin said c llar is an annular plate '2'3ehaving a flat top face in which is formed an annular roove 24 Disposed in said groove is; a packing ring. or gasket 25? which t engages with th bottom surface of the plate 21 In the bottom surface of the annular plat 23 'isformed a-concaved seat 2'6 in which seats an annular pa"ckin'grin'gfizi snug fly fitting upon the coll'ar'22 helicalex pansion s nng 28 surrounds the extremity of the co iar '22 and engages at one end such movement.

against said packing ring 27 a and engages at its other end against the bottom wall of the cup shapedv member 29 which is formed in a manner preventing lateral shifting of said spring 28?. Y

- j It is apparent that in both instances a connection' is, provided for each inlet neck end provide a tight joint. ,Should the movement of the neck be slightlylaterally the packing 27 will shift in-the seats26"to'accommodate As'the parts associated with the inlet neck '18" are substantially the same; the corresponding parts will accommodate the movements takenby saidneckf The constructiondescribed, is efficient; operationand will automatically take up such wear as'develops in thepackings so thatth ey are at allfltimes-watertight.

While in describing my invention, I-have referred in detail to the form, arran ement and construotionof the several parts thereof, the same is to be considered merely as illustrative so'tha't I dofnot wish to be limited th'e're'to ex'cept as may be specifically set forth in the appended claims. y

I claim as my invention I 1, A locomotive'boiler having afirebox, a

' water steaming and circulating member disposed in the firebox andhaving a tubular inlet end opening through one; or the sheets thereof so "as'to-communicate with the water space of the boiler and means associated with said sheetand including a packing's'urrounding -said inletend and providing a connection for said-inlet end which permits of both a longitudinal and alateral movement of said neckwithout leakage about the same.

2. loeoniotiveboller. having a-firebox, a

water steaming and circulatingmemb'er'disposed injthe fireboxand having a tubular inlet end opening through one of the sheets thereof soas to communicate withthe water space of the boiler, aflpla te fixed with respect to saidsheet of the firebox, an annular plate in close proximity to 'said first mientioned plate'and' movable with respect thereto, and which annular plate has'an annularcfoncaved seat therein 's urroundingj 'said inletend of said water steaming'and circulating member, a packing dlspps'edbetween said plates, a second packing disposed in said annular, concaved seat and a means exertlng" apressure upon "both packings and causing said; second packingt'o closely eng ge in Said Seat upon said inlet end. a

3; A locomotive having a firebox including a fire and a combustion chamber, a thermic siphon in each chamber and each including an elongated discharge end opening thru the crown sheet and a tubular inlet end opening through the front sheet of the fire chamber Y and the bottom wall of the combustion chamber respectively, and means arranged in the water space of the boiler and associated with said throat sheet and bottom wall respectively and surrounding said inlet ends and providing a connection for said inlet ends permitting of both a longitudinal slip movement and a lateral movement of said inlet ends said means in each instance including a packm Z. A locomotive boiler having a firebox, a plate fixed with respect to the inside of one of the sheets thereof and which plate has an opening therein, a water steaming and circulating member in the firebox and having a tubular inlet end extending through said plate opening into the water space of the boiler, a ring surrounding that part of said inlet end in said water space, a packing between said ring and plate, a second packing between said ring and said inlet end and means acting upon said second packing in connection with said ring for causing said second packing to normally contract upon said inlet end and to compress the first mentioned packing between said plate and ring.

In testimony whereof, I have hereunto set my hand, this 13 day of August, 1929.

- WALTER H. HINSCH. 

